Number of 3Xn 0..3 arrays with row sums nondecreasing and column sums unimodal.

A224125

Number of 3Xn 0..3 arrays with row sums nondecreasing and column sums unimodal.

Terms

    a(0) =20a(1) =1080a(2) =47059a(3) =1703178a(4) =53355889a(5) =1491827492a(6) =38051383139a(7) =899713542225

External references